linux-kernel - Re: [PATCH v2] iommu: Set owner token to SVA domain

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Date:   Fri, 8 Dec 2023 11:15:00 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iommu: Set owner token to SVA domain

On 08/12/2023 1:53 am, Lu Baolu wrote:
> Commit a9c362db3920 ("iommu: Validate that devices match domains") added
> an owner token to the iommu_domain. This token is checked during domain
> attachment to RID or PASID through the generic iommu interfaces.
> 
> The SVA domains are attached to PASIDs through those iommu interfaces.
> Therefore, they require the owner token to be set during allocation.
> Otherwise, they fail to attach.
> 
> Set the owner token for SVA domains.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Fixes: a9c362db3920 ("iommu: Validate that devices match domains")
> Cc: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>   drivers/iommu/iommu.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> Change log:
> v2:
> - The user domain allocation path does the right thing. Hence no need
>    to fix anything.
> v1:
> - https://lore.kernel.org/linux-iommu/20231207021938.306738-1-baolu.lu@linux.intel.com/
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 0d25468d53a6..d0a28667479a 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -3617,6 +3617,7 @@ struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
>   	domain->type = IOMMU_DOMAIN_SVA;
>   	mmgrab(mm);
>   	domain->mm = mm;
> +	domain->owner = ops;
>   	domain->iopf_handler = iommu_sva_handle_iopf;
>   	domain->fault_data = mm;
>